Birth Date: 15 Feb 1989
Place of Birth: Hiroshima, Hiroshima Prefecture, Japan
Personal Name: Ayaka Nishiwaki
Ayaka Nishiwaki (西脇 綾香, Nishiwaki Ayaka), nicknamed A~chan (あ~ちゃん, stylized as a-chan), is a Japanese singer and dancer. She is known as one of the members of the Japanese electropop group Perfume.